Responsively

About Responsively

Responsively App is a browser built specifically for web developers to test and build responsive web applications. It displays multiple device viewports side-by-side simultaneously, and mirrors clicks, scrolling, and navigation performed in one device across all displayed devices in real time. Users can save favorite device combinations as Preview Suits for quick switching between testing configurations, and the app ships with a large library of built-in device profiles alongside support for adding custom devices.

Additional tools include a Unified Inspector for examining elements across all devices at once, one-click full-page or individual-device screenshots, and standard browser features such as cookie management, local storage, session storage, and bookmarks, along with access to devtools. The application is free and open source, with 20,400 GitHub stars and over 150,000 downloads reported.

Key features

• View all devices at once, side-by-side, without resizing devtools
• Mirrored interactions — clicks, scrolls, and navigation replicate across all devices in real-time
• Save device combinations as Preview Suits for quick context switching
• Large collection of built-in device profiles, plus custom device support
• Unified Inspector to inspect elements across all devices at once
• One-click full-page or per-device screenshots

Frequently asked questions